This article explains how to deposit USD into the USD Prime Vault in KAST Earn, how USD is exchanged for USDKY, a 1:1 backed stablecoin powered by M0, and how to withdraw back to your USD Spending Balance. You’ll also learn how variable yield works and where USDKY is held.
What is the USD Prime Vault?
The USD Prime Vault is a way to earn yield on USD inside KAST Earn.
When you deposit, your USD is converted into USDKY, a 1:1 backed stablecoin powered by M0.
Here is what that looks like in practice:
- Deposit: USD is converted into USDKY inside KAST Earn.
- Earn: USDKY accrues yield over time, and that yield is reflected in the value of your vault balance.
- Withdraw: Funds are withdrawn to your USD Spending Balance.
This is designed for people who keep USD on hand and want a simpler option for earning on idle dollars.
How to start earning with the USD Prime Vault
| 1. From the dashboard, tap Accounts. | |
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2. Select Earn, then tap Deposit |
| 3. Choose the USD Prime Vault. | |
| 4. Tap Deposit. | |
| 5. Enter the amount. | |
| 6. Tap Confirm. |
How to withdraw from the USD Prime Vault
| 1. Tap Withdraw | |
| 2. Enter the amount | |
| 3. Tap Confirm |
Frequently Asked Questions
Is there a minimum amount required to start earning?
You can start with any amount. Very small balances under $0.01 may not appear in your main dashboard view.
Can I transfer USDKY to other users or withdraw it externally?
No, USDKY in the Vault is only used to earn yield inside KAST. To move funds, you first withdraw it back to your USD Spending Balance.
Are there fees to deposit or withdraw?
No, there are no transaction fees. Moving funds between your USD Spending Balance and the USD Prime Vault is free.
How is the APY calculated?
APY is variable and reflects market conditions, specifically the yield on short-term U.S. Treasury Bills. The rate you see is the rate applied to the value of your vault balance.
Is there a lockup period?
No, there is no lockup period. You can deposit and withdraw at any time.
Where is USDKY held?
USDKYis issued on the Solana blockchain and held in your dedicated Privy wallet (Privy is a Stripe company). It remains in your control while it accrues yield.
How is the yield paid out?
Instead of receiving a separate payment, the redemption value of your USDKY tokens increases automatically. When you withdraw to your USD Spending Balance, you receive your original deposit plus the accrued yield.
What happens when the APY changes?
Nothing you need to do. Your balance automatically accrues based on the current rate.
I withdrew my funds but don’t see them in my USD balance yet.
Transfers are usually near-instant. If your funds do not appear within a few minutes, contact support.
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